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7/29/2019 FD Static vs Dynamic Cb Fp 2010 26
1/1
Eligible for Continuing Education Units (CEUs)
at www.nfaonline.dhs.gov
For archived downloads, go
www.usfa.dhs.gov/nfa/coffee-brea
Building Construction: Fire Dampers
No. FP-2010-26 June 29, 2010
Learning Objective: The student shall be able to explain fre damper installation requirements.
Fire dampers are installed in an air-distribution system,and are designed to close automatically upon detectiono heat, to interrupt migratory air ow, and to restrict the
passage o ame. They are required in order to maintain
the required integrity o a fre resistance assembly when
ducts penetrate fre-rated walls, partitions, or oors.
Fire dampers are required by either the model building or
mechanical codes or National Fire Protection Association
(NFPA) 90A, Standard or the Installation o Air Conditioning and
Ventilating Systems. Fire dampers are manuactured with fre-resistance ratings o 90 or 180 minutes.
Dampers are classifed or use in both static and dynamic
heating, ventilating, and air conditioning (HVAC) systems.
A static air handling system is one where the air movement is stopped on the activation o a smoke detection
device. In a dynamic air handling system, the air continues to ow. Dynamic system dampers must be labeled
with the maximum rated air ow under which the damper will close, the maximum pressure dierential across
the damper ace when it is in the closed position, and the air ow direction.
Building and mechanical codes require that fre dampers are listed in accordance with the requirements o Un-
derwriters Laboratories (UL) Standard or Fire Dampers, UL 555, and have the testing agencys label attached. Dampers
must be installed in accordance with the manuacturers installation instructions.
Damper mountings are noted or vertical or horizontal positions, or both. There must be an access point in the
duct or inspection, maintenance, and resetting. The access door should be located as close as practicable to the
damper and, i easible, at the underside o the duct. The access should be located so that the dampers spring catch
and usible link are accessible in the closed position.
The duct opening must be identifed with letters o a minimum o 1/2-inch (12.7 mm). The minimum access
door should be 18 by 16 inches (457 by 406 mm) when duct size permits. For dampers that are too large or an
ordinary persons arm to reach rom the outside o the duct to reset the damper and replace the link, the accesssize should be 24 by 16 inches (610 by 406 mm) to allow a person to enter the duct.
For additional inormation, reer to ULs. Marking and Application Guide at http://www.ul.com/global/eng/
documents/oerings/perspectives/regulators/electrical/newsletters/dampers.pd
This re damper has been released to illustrate its closed condition. One-
half of the fusible link remains.